Videos from an officer's body camera and a dashboard camera from inside a police vehicle were released after the Charlotte police chief decided it would not "adversely impact" the investigation.

"What we are releasing are the objective facts," said Chief Kerr Putney, calling the shooting "a complex case".

While it wasn't clear in either the family's or the police's video, Mr Murray says "all the credible evidence" says Mr Scott was armed at the time.

A gun recovered at the scene was found to be loaded with one bullet and had Mr Scott's DNA on the grip and slide.

After Mr Murray's announcement, attorneys for Mr Scott's family said while they appreciate the respect and courtesy Mr Murray and his department have shown the family, they will continue to investigate the incident.

"We still have concerns and it's important for the public to understand that this doesn't end our inquiry," said Charles Monnett, one of the family's attorneys.

"There are differing legal standards that apply to a decision about whether an officer should be criminally charged with the discharge of their weapon in the use of deadly force and whether the department, the officer or the city should be held civilly liability for negligence for the way this situation was handled."

Mr Monnett said the family still has "real questions" about whether the Charlotte officers acted appropriately, including "whether they used appropriate de-escalation techniques to end this situation in a way that didn't end in the loss of Keith Scott's life".

He asked that if anyone protests after the incident, they do so lawfully and peacefully.